Ultrasonic stress relieving method and system

Abstract

The invention relates to an ultrasonic stress relieving method. The method comprises the steps that an ultrasonic transducer is connected to a wave guiding rod, the wave guiding rod is fixedly connected to a processed component, and a vibration system is composed of the ultrasonic transducer, the wave guiding rod and the processed component which are sequentially connected; an ultrasonic drive power source carries out frequency scanning on the vibration system, the vibration frequency, closest to the resonance frequency of the ultrasonic transducer and highest in amplitude, of the vibration system is selected as the excitation frequency, and ultrasonic excitation treatment is carried out on the processed component; frequency tracking is carried out on the vibration system, and the resonance state of the vibration system is maintained; and frequency modulation is carried out on the excitation frequency output by the ultrasonic drive power source, at least one resonance modal forming the coupling relationship with a modal corresponding to the resonance frequency of the vibration system is excited, and simultaneous excitation of a plurality of resonance modals is achieved. The invention further relates to an ultrasonic stress relieving system.

Description

technical field [0001] The invention relates to the field of ultrasonic vibration, in particular to an ultrasonic stress elimination method and system. Background technique [0002] Metal components undergo welding, casting, forging, machining and other processes, causing internal lattice deformation, which will inevitably generate residual stress, greatly reduce the ultimate strength and fatigue strength of the component, and even produce cracks and brittle fractures. Due to the relaxation of residual stress during use, the parts are deformed, which greatly affects the size, position accuracy and overall performance of the components. Reducing this internal stress is currently mainly through aging methods. The aging treatment process has been widely used in shipbuilding, metallurgy, machine tools, mining, chemical industry, electric power and other industries, and has received significant economic benefits. [0003] First, the definitions of the terms mentioned in this ar...

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Problems solved by technology

[0010] However, the above ultrasonic impact aging equipment has the following limitations:

[0011] 1. It cannot excite the overall resonance of the treated component, but only excites local vibration near the impacted area to eliminate the nearby residual stress; and the depth of the action layer is limited, generally 1-10mm, which cannot eliminate the residual stress inside the entire component

[0012] 2. The ultrasonic vibration system is not directly connected to the processed component. The impact head and the processed component are in single-point non-fixed contact or multi-point discontinuous and non-fixed contact. It is necessary to move the impact head to process different parts, which is inefficient

[0013] 3. The impact head will cause pits, grooves and other damage to the surface of the component to be processed, which will affect the surface quality of the component, and is not suitable for components with high surface accuracy and size requirements

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